Move webui from /loop/webui to /webui

Thanks, perl (and git mv):

	perl -pi -e s,loop/webui,webui,g $(git grep -l loop/webui)
diff --git a/DEVELOPMENT.md b/DEVELOPMENT.md
index 88834b5..6052b51 100644
--- a/DEVELOPMENT.md
+++ b/DEVELOPMENT.md
@@ -3,7 +3,7 @@
 ## Running tests
 
 * `go test ./...`
-* `cd loop/webui && CI=1 npm run test`
+* `cd webui && CI=1 npm run test`
 
 ## Synchronizing Go structs and TypeScript types